Deconstructor For Mac



Posted March 1, 2006 by William_Wilson in C programming

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The following tech recipe describes how to implement a C++’s Destructor efficiently.


When writing a destructor, it is important to understand why and what you are writing before you begin.
*A structure and a pointer tech recipe are on the way to explain anything thing complex here.
To point or rather to not point: a destructor removes pointers in the case of manually watching your memory leak. This method is automatically called whenever an object loses scope.

The Scope is part of the code (e.g., method, class, etc.) in which a variable or parameter can be accessed.

Thus, it takes care of all local and dynamic variables for us, preventing memory leak if it is written properly.

*The example will be written as if it were inside a class which has a structure within it implementing a linked list by the pointer:
Next* next;
(which, of course, the struct is called Next)

Destructor Syntax:

~Destructor() {}

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-A destructor never takes any parameters. Its only parameter is the implied one accessible by this.
-It always starts with a ~, tild or tilda, as it is known.

Now, within a structure implementing a linked list, this becomes the most crucial part of your code. The structure not only has things pointing to it, but it is also pointing to other objects of its own type. These all need to be handled dynamically, but how is this done?
*As stated previously, C++ will call this for every object, but we have no way to be sure that it will be efficient and call them in the reverse order in which they are pointing. If we were to delete the lead pointer only, it is possible that C++ would accept this as a completed destruction, which is not true.
As long as the other pointers and objects are linked, the memory is not freed, and we have memory leak.

So, we need to delete all pointers below the current this object to insure a proper destruction. If all goes well, each object will only destroy one pointer, but we cannot be sure of this.

This will require a loop and a temp variable (which we will also destroy at the end of the destructor).

Complete Linked List Destructor:
*This is within the Next structure, so it gets the title of its class or struct.

~Next(){
Next* n = this->next;
Next* nn = NULL;
while(n){
nn = n->next;
delete n;
n = nn;
}
nn = NULL;
n = NULL;
}

-This loop is based on n which is true as long as n is not NULL. (e.g., There is another Next object in the linked list.)
This code iterates through the linked list objects and deletes the pointers one by one, once it is finished with all pointers below itself setting the temporary variables to NULL. This will allow the GC or Garbage Collector to destroy them.

This example is meant to improve your knowledge of memory leak. The less leakage there is in your own programs, the better because we all know that Operating Systems are not leak free. The more help we can give them, the better.

Questions/Comments: [email protected]
-William. §

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re·con·struct

(rē′kən-strŭkt′)tr.v.re·con·struct·ed, re·con·struct·ing, re·con·structs
2. To assemble or build again mentally; re-create: reconstructed the sequence of events from the evidence.
3. Linguistics To deduce the form and properties of (a protolanguage or an unattested word) based on evidence from attested languages, such as cognate words.
4. To cause to adopt a new attitude or outlook: a diehard traditionalist who could not be reconstructed.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

reconstruct

(ˌriːkənˈstrʌkt) vb (tr)
1. to construct or form again; rebuild: to reconstruct a Greek vase from fragments.
2. to form a picture of (a crime, past event, etc) by piecing together evidence or acting out a version of what might have taken place
ˌreconˈstructionn
ˌreconˈstructorn
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

re•con•struct

(ˌri kənˈstrʌkt)
v.t.
2. to re-create in the mind or in a simulation from available information: to reconstruct the events of the murder.
re`con•struct′i•ble, re`con•struc′tive,adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

reconstruct


Past participle: reconstructed
Gerund: reconstructing
Imperative
reconstruct
reconstruct
Present
I reconstruct
you reconstruct
he/she/it reconstructs
we reconstruct
you reconstruct
they reconstruct
Preterite
I reconstructed
you reconstructed
he/she/it reconstructed
we reconstructed
you reconstructed
they reconstructed
Present Continuous
I am reconstructing
you are reconstructing
he/she/it is reconstructing
we are reconstructing
you are reconstructing
they are reconstructing
Present Perfect
I have reconstructed
you have reconstructed
he/she/it has reconstructed
we have reconstructed
you have reconstructed
they have reconstructed
Past Continuous
I was reconstructing
you were reconstructing
he/she/it was reconstructing
we were reconstructing
you were reconstructing
they were reconstructing
Past Perfect
I had reconstructed
you had reconstructed
he/she/it had reconstructed
we had reconstructed
you had reconstructed
they had reconstructed
Future
I will reconstruct
you will reconstruct
he/she/it will reconstruct
we will reconstruct
you will reconstruct
they will reconstruct
Future Perfect
I will have reconstructed
you will have reconstructed
he/she/it will have reconstructed
we will have reconstructed
you will have reconstructed
they will have reconstructed
Future Continuous
I will be reconstructing
you will be reconstructing
he/she/it will be reconstructing
we will be reconstructing
you will be reconstructing
they will be reconstructing
Present Perfect Continuous
I have been reconstructing
you have been reconstructing
he/she/it has been reconstructing
we have been reconstructing
you have been reconstructing
they have been reconstructing
Future Perfect Continuous
I will have been reconstructing
you will have been reconstructing
he/she/it will have been reconstructing
we will have been reconstructing
you will have been reconstructing
they will have been reconstructing
Past Perfect Continuous
I had been reconstructing
you had been reconstructing
he/she/it had been reconstructing
we had been reconstructing
you had been reconstructing
they had been reconstructing
Conditional
I would reconstruct
you would reconstruct
he/she/it would reconstruct
we would reconstruct
you would reconstruct
they would reconstruct
Past Conditional
I would have reconstructed
you would have reconstructed
he/she/it would have reconstructed
we would have reconstructed
you would have reconstructed
they would have reconstructed
Collins English Verb Tables © HarperCollins Publishers 2011
Verb1.reconstruct - reassemble mentally; 'reconstruct the events of 20 years ago'
retrace, construct
hypothesise, hypothesize, speculate, conjecture, theorise, theorize, hypothecate, suppose - to believe especially on uncertain or tentative grounds; 'Scientists supposed that large dinosaurs lived in swamps'
etymologise, etymologize - construct the history of words
2.reconstruct - build again; 'The house was rebuild after it was hit by a bomb'
construction, building - the act of constructing something; 'during the construction we had to take a detour'; 'his hobby was the building of boats'
build, construct, make - make by combining materials and parts; 'this little pig made his house out of straw'; 'Some eccentric constructed an electric brassiere warmer'
3.reconstruct - cause somebody to adapt or reform socially or politically
alter, change, modify - cause to change; make different; cause a transformation; 'The advent of the automobile may have altered the growth pattern of the city'; 'The discussion has changed my thinking about the issue'
4.reconstruct - return to its original or usable and functioning condition; 'restore the forest to its original pristine condition'
decompress, uncompress - restore to its uncompressed form; 'decompress data'
regenerate, renew - reestablish on a new, usually improved, basis or make new or like new; 'We renewed our friendship after a hiatus of twenty years'; 'They renewed their membership'
rehabilitate - help to readapt, as to a former state of health or good repute; 'The prisoner was successfully rehabilitated'; 'After a year in the mental clinic, the patient is now rehabilitated'
rehabilitate - restore to a state of good condition or operation
defibrillate - stop the fibrillation and restore normal contractions, usually by means of electric shocks; 'The patient's heart had to be defibrillated to save his life'
5.reconstruct - do over, as of (part of) a house; 'We are remodeling these rooms'
remodel, redo
alter, change, modify - cause to change; make different; cause a transformation; 'The advent of the automobile may have altered the growth pattern of the city'; 'The discussion has changed my thinking about the issue'
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

reconstruct

verb
1.rebuild, reform, restore, recreate, remake, renovate, remodel, re-establish, regenerate, reorganize, reassembleThe government must reconstruct the shattered economy.
2.build up a picture of, build up, piece together, deduce, re-enactElaborate efforts were made to reconstruct what had happened.
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002

reconstruct

verbTo bring back to a previous normal condition:
rebuild, reclaim, recondition, rehabilitate, reinstate, rejuvenate, renovate, restitute, restore.
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
rekonstruovat
rekonstruál
atsaukt atmiņā
rekonštruovať

reconstruct

[ˈriːkənˈstrʌkt]VT [+ building] → reconstruir; [+ crime, scene of crime] → reconstituir
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

reconstruct

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[ˌriːkənˈstrʌkt]vt
(= rebuild) [+ building, road, city] → reconstruire
(= renew, reinvigorate) [+ economy, country] → rebâtir
(= change) [+ system, policy] → réformer
Collins English/French Electronic Resource. © HarperCollins Publishers 2005

reconstruct

vtrekonstruieren; cities, buildingwieder aufbauen; to reconstruct one’s life(im Leben) noch einmalvon vornanfangen
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995

reconstruct

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(riːkənˈstrakt) verb
to create a complete description or idea, on the basis of certain known facts. Let us try to reconstruct the crime. rekonstrueer يَبْني ثانِيَةً، يُعيد تَمْثيل الجَريمَه възстановявам reconstruir rekonstruovat rekonstruieren rekonstruere ανασυνθέτω, αναπλάθω, αναπαριστάνωreconstruir rekonstrueerima بازسازی کردن؛ دوباره ساختن rekonstruoida reconstituer לְשַקֵם फिर से बनाना या निर्माण करना rekonstruirati, obnoviti rekonstruál merekonstruksi endurgera ricostruire 復元する 재현하다 atkurti, rekonstruoti rekonstruēt; restaurēt; atsaukt atmiņā menggambarkan reconstruerenrekonstruere, gjenoppbyggerekonstruować بياودانول، بياروغول reconstruir a reconstitui воспроизводить rekonštruovať obnoviti rekonstruisati rekonstruera สร้างใหม่ yeniden tasarlamak (根據已知數據)重建,再現 перебудовувати, реконструювати تعمیر نو کرنا dựng lại (根据已知数据)重议,重定,重建

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ˌreconˈstruction (-ʃən) noun
rekonstruksie إعادَة بِناء възстановяване reconstrução rekonstrukce die Rekonstruktion rekonstruktion ανασυγκρότηση, ανάπλαση, αναπαράστασηreconstrucción rekonstruktsioon بازسازی rekonstruointi reconstructionשחזור पुनर्रचना rekonstrukcija, obnova újjáépítés, rekonstrukció rekonstruksi endurgerð ricostruzione 復元 재현 atkūrimas, rekonstrukcija rekonstrukcija; restaurācija; atjaunošana penggambaran reconstructierekonstruksjon, gjenreisingrekonstrukcja بيرته سمونه، بياجوړونه، بياروغونه reconstrução reconstituire воспроизведение rekonštrukcia obnovitev rekonstrukcija rekonstruktion การสร้างใหม่ yeniden tasarlama 重建,再現 перебудова, реконструкція تعمیر نو sự dựng lại 重议,重定,重建

Constructor For Mac

Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.

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reconstruct

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English-Spanish Medical Dictionary © Farlex 2012
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

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